Hackers have reportedly attacked a popular adult website PornHub, and unsuspecting visitors could have their profiles exposed to the general public.

The large-scale attack, as reported by internet security experts Proofpoint, “exposed millions of potential victims in the US, Canada, the UK, and Australia.”

Known as malvertising – a portmanteau of “malicious” and “advertising” – the attack saw hackers hijack advertising platforms to deliver fake browser updates for the three most popular Windows browsers.